Selling a bunch of bluetooth parts for hands free calling for your Z4, this would be great to have if you wish to convert your car to bluetooth or have around as a spare if your system dies.
part numbers
are,
6520-6913-896 antenna amplifier. $122 from Tisher
8410-9120-843 Telematics Control Unit. $1454 from Tisher
8450-6928-461 Blue tooth antenna. $20 from Tisher
plus wires.
selling everything for
$450